Mitsubishi Electric MELSEC iQ-R Series Reference Manual page 27

Remote head module
The remote head module receives the inter-module synchronization timing from the master station to perform each refreshing
according to the inter-module synchronization cycle and transfer the timing to the mounted modules.
With this, the input data can be retrieved and the output data can be written at the same inter-module synchronization cycle
timing as that of the system of the master station.
CPU module
System of
the master
station
Network module
(master station)
Remote head
module
1) Transfer the inter-module
synchronization timing.
System of
the remote
head module
Input module
Output module
(1) Input refresh
(2) Intelligent function module refresh (transfer to the CPU module)
(3) Link refresh (RWw, RY)
(4) Link refresh (RWr, RX)
(5) Intelligent function module refresh (transfer to the intelligent function module)
(6) Output refresh
The following table shows details of the data refreshed according to the inter-module synchronization.
Item Refresh operation
Input Input refresh
Intelligent function module
refresh
Link refresh
Output Output refresh
Intelligent function module
refresh
Link refresh
Inter-module
synchronization cycle
Inter-module synchronous
interrupt program
Link Operation Link
Normal program
refresh refresh
processing
(RWr, RX) (RWw, RY)
Cyclic transmission
Cyclic transmission
(1) (2) (3) (4) (5) (6)
2) Input refresh
Input
Inter-module
synchronization cycle
Device
X
Buffer memory (transfer to the CPU
module)
RWr, RX
Y
Buffer memory (transfer to the
intelligent function module)
RWw, RY
Inter-module
synchronization cycle
Inter-module synchronous
interrupt program
Link Operation Link
Normal program
refresh refresh
processing
(RWr, RX) (RWw, RY)
Cyclic transmission
Cyclic transmission
(1) (2) (3) (4) (5) (6)
Input
Output
Inter-module
synchronization cycle
Remarks
Refreshes only the items assigned to the target modules
of the inter-module synchronization.
Refreshes only the items of the inter-module
synchronization function.
Refreshes all the signals set on the master station.
Refreshes only the items assigned to the target modules
of the inter-module synchronization.
Refreshes only the items of the inter-module
synchronization function.
Refreshes all the signals set on the master station.
5.1 Fixed Cycle Synchronization Function
Inter-module
synchronization cycle
Inter-module synchronous
interrupt program
Link Operation Link
Normal program
refresh refresh
processing
(RWr, RX) (RWw, RY)
Cyclic transmission
Cyclic transmission
(1) (2) (3) (4) (5) (6)
3) Output refresh
Input
Output
Inter-module
synchronization cycle
5 FUNCTION
5
Output
25